Rotary engine



(No Model.) 2 sheetssheet 1. E. S. PAMELA.

ROTARY ENGINE. No 330,417. Patented Nov. 17, 1885.

` (No Model.) 2 Sheets-Sheet 2.

E. S. PAMBLA.

RUTARY ENGINE. No. 330,417. Patented Nov. 171885.

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UNITED STATES PATENT EDWARD S. PAMBLA, OF CHICAGO, ILLINOIS.

ROTARY ENGINE.

SPECIFICATION forming part of Letters Patent No. 330,417, dated November1'7, 1885.

Application filed December 20, 1884. Serial No. 150,803. (No model.)

To @ZZ whom t may concern:

Be it known that I, EDWARD S. PAMELA, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented certain new and'useful Improvements in Rotary Engines, 'ofwhich the following is a specification, to wit:

This invention relates to an improvement in rotary engines; and itconsist-s in certain novel details of the construction and arrangementoi' the same, substantially as will be hereinafter more fully set forthand claimed.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the accompanying drawings, inwhich- Figure l is a vertical transverse section; Fig. 2, a longitudinalvertical section. Figs. 3 and 4 are end views of the regulating cutoffdevice, and Fig. 5 is a View of thejournal of the main shaft.

A represents the main bed or frame of the engine forming the cylinder7through which runs the main shaft A, as represented. Upon this shaft isplaced the revolving piston-head A2, which is suitably packed to preventthe escape of steam around it, as at a, and in the bottom of the maincasting is formed an outlet-port, af, by which the steam escapes afterperforming its work.

It will be observed that the piston A2 consists of a cylindrical mainportion fixed securely upon and turning with the shaft formed with alongitudinal projection, which forms the head and closes the spaceforming the annular steam-chamber between the cylindrical head and theouter portion of the casing, as fully seen in Fig. 1.

In the lower portion of the main casting or bed A, opposite theexhaust-port a', is an inletport, a2, to receive the live steam from theboiler, and this port passes through into the steam-cylinder. In thesupply-passage a2 is placed a rock-valve, B, cut away on one side toprevent closing the outer end of thesupply and having one or more ports,b, through it to form the connection between the two portions of thepassage a2, as represented. Beneath the cylinder, and forming a portionof the lower wall of the same, is a rocking steamhead, C, upon a shaft,G, the casting A being recessed, as at b', to receive the head C when itis turned down to allow the piston-head to pass. Steam being admitted tothe inlet-port a2, passes into the cylinder between the rockingsteam-head and the piston-head and forces the latter around. As thepiston-head nears the completion of its full revolution, the steam iscut off by the movement of the valve B, and the steam-head is throwndown to allow the piston to pass it, after which it is at once thrown upagain, and the valve shifted to admit the steam again. This operation iscontinued as'long as the engine is in operation.

To automatically operate the valve and steam-head at the properintervals, I secure upon the end of the main shaft A a fly-wheel or beltpulley, D, upon one side of which, hinged upon the spokes, are two arms,D', provided with weights D2, adjustable in or out upon the arms bymeans of set-bolts d, as indicated in Fig. 3. Upon the opposite side ofthe Wheel D, on the pivot of each arm D, is secured a segment-gear, E,both of which engage agearwheel, E, loose upon the shaft or upon the hubof the wheel D, as may be desired. The gear E has attached to it uponits rear side a disk, e, having a cam projection, c', for cutting offsteam, as will be presently explained. Attached to and turning with theshaft and fly- Wheel is a disk, G, having its outer edge formed orprovided with a iiange, y, at one point of which is a cam, g',projecting inward, as fully seen in Fig. 4, which serves to operate therock-valve to admit steam at proper times, as indicated. The valve-stemB is provided with an arm, B2, carrying a friction-roller, b2, whichruns upon the inner side of the iiange g of the plate G, while the shaftC of the steam-head C has an arm, C, witha small roller, c2, running ina cam-groove, g2, in the back of the plate G, as in dotted lines in Fig.4.

When the engine is running, the revolution of the shaft and its devicesare as follows: rlhe steam-head is thrown down and up by the cam-groove,with which its crank-arm C2 connects at the proper times to allow of thepassage of the piston. The valve-arm B2 is thrown inward by the cam g onthe flange g, and admits steam till the cam e on the disk e IOO comes incontact with it and throws it back again to cut off steam. rlhis cam eis turned round to meet this arm sooner or latervby the action of theweighted arms D', which fly outward with greater or less force as thespeed varies, thus cutting off steam at the proper point to keep theengine running at a steady speed. I also make the cam e separate fromthe disk e, and connect it adj ustably thereon by means of a set-screwor equivalent device, in order that it may be adjusted to cut off forexpansion at any point desired, thus making a simple and economicalengine, using steam t0 the best advantage, and maintaining a uniformspeed. It will be observed that this engine has little or no clearance.The parts are all easily removed for repairs, and the parts are all ofstrong and durable form, not liable to get out of order, and capable ofbeing operated at high speed.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

l. In a rotary engine, a rocking valve located in the supply-passage andhaving a stem provided with an arm carrying a friction-roller,.incombination with a disk upon the main shaft provided with a cam engagingI this arm to throw the valve in one direction to open the passage and asecond cam to throw it in the other direction to close the passage,substantially as and for the purpose set forth.

2. In a rotary eng-ine, the combination, with a rock-valve in thesupply-passage, having a stem and an operating arm thereon, of a camsecured upon the main shaft and contacting with this arm at a statedpoint in its revolution to yopen the valve, and a second cam adjustablysecured upon the 'shaft to close the valve, whereby the steam is outoffvfor eX- pansion at any desired point, substantially as and for thepurpose set forth.

3. In a rotary engine, the combination, with a rocking valve located inthe supply-passage and provided with a stem carrying a projecting arm,of a cam Xed upon and revolving with the driving-shaft to open the valveand a second cam for closing the valve loose upon said driving-shaft andconnected to a weighted arm hinged upon the shaft and thrown out bycentrifugal force, whereby the revolutions of the shaft alter theposition of the cut-off cam to regulate the speed and keep it uniform,substantially as and for the purpose set forth.

4. In a rotary engine', the casing A, formed with the ports a a2, theshaft A', piston-head A2, the valve B, having stein B and arm B2, andthe rocking steam-head C, having a stem or shaft, C', and arm C2, incombination with the fly-wheel D upon the main shaft, weighted arms D,the segments E, gear E', with its arm disk e e', and the disk G, havingthe camflange g g and cam-groove g?, all constructed and arranged tooperate substantially as and for the purpose set forth.

In testimony whereof I affix my signature in I presence of twowitnesses.

EDWARD S. PAMELA.

Witnesses:

NV. C. MOARTHUR, (l1-Iris. KREssMANN.

